Configuring the Clock Control Unit

The STR750 devices contain a Reset & Clock Control Unit configured as follows:

#include <75x_lib.H>
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void main (void)  {
  RCCU_MCLKConfig(RCCU_DEFAULT);                  // MCLK = RCLK
  RCCU_FCLKConfig(RCCU_RCLK_2);                   // FCLK = RCLK/2
  RCCU_PCLKConfig(RCCU_RCLK_4);                   // PCLK = RCLK/4
  RCCU_PLL1Config(RCCU_PLL1_Mul_12, RCCU_Div_2);  // 48MHz PLL @16MHz XTAL

  while (RCCU_FlagStatus(RCCU_PLL1_LOCK) == RESET); // Wait for PLL Lock
  RCCU_RCLKSourceConfig(RCCU_PLL1_Output);          // Select PLL for RCLK
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}

This configuration sets a CPU clock of 48MHz when using the 16MHz XTAL provided on the MCBSTR750 Board. You may review the clock setup in µVision, in the dialog Peripherals - Power, Reset and Clock Control Unit.